class_docstr: String Printer for vector expressions. 
code: def _print_Derivative(self, e):
      from sympy.physics.vector.functions import dynamicsymbols
  
      t = dynamicsymbols._t
      if bool(sum([i == t for i in e.variables])) & isinstance(
          type(e.args[0]), UndefinedFunction
      ):
          ol = str(e.args[0].func)
          for i, v in enumerate(e.variables):
              ol += dynamicsymbols._str
          return ol
      else:
          return StrPrinter().doprint(e)
  
imports: from sympy.core.function import Derivative
  from sympy.core.function import UndefinedFunction, AppliedUndef
  from sympy.core.symbol import Symbol
  from sympy.interactive.printing import init_printing
  from sympy.printing.latex import LatexPrinter
  from sympy.printing.pretty.pretty import PrettyPrinter
  from sympy.printing.pretty.pretty_symbology import center_accent
  from sympy.printing.str import StrPrinter
  from sympy.printing.precedence import PRECEDENCE
label_desc: Use image node_id 1 for calling the VectorStrPrinter obj's underlying member method code with example usage: obj._print_Derivative(e) and returns: ol, StrPrinter